It would take approximately 311 tiles plus 5% to 10% waste depending on how you lay your floor out and how many cuts you will have.
67 tiles.
10
100 tiles or 96 which is the correct amount
288
266.666666666 so rounding up 267 tiles.
67 tiles.
192 tiles
220
start with 38 tiles.
The answer depends on the measurement units used for 18x18.
22.2 tiles so buy 23 tiles.
10
100 tiles or 96 which is the correct amount
288
118
266.666666666 so rounding up 267 tiles.
You'll need 200 18-inch tiles.